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Finding the Fourth Proportional to 348.78, 523.40 and 257.71

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Solution

The fourth proportional to 348.78, 523.40 and 257.71 is: 386.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.78 : 523.40 = 257.71 : x
  2. Step 2: Convert to fraction form
    348.78/523.40 = 257.71/x
  3. Step 3: Cross multiply
    348.78x = 523.40 × 257.71
  4. Step 4: Simplify right side
    348.78x = 134,885.41
  5. Step 5: Solve for x
    x = 134,885.41/348.78
  6. Step 6: Final answer
    x = 386.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.